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Old 08-18-2016, 09:21 AM
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Exclamation Serious problem. Need help!

OK so this is my wife's truck, 07 hemi limited 160k. Driving to work, at highway speeds she gets a serious bucking, almost a instantaneous stalling of the motor. To the point it locks up the drive train and cause a quick chip of the tires. Throws a P3425 code, Cylinder 4 Deactivation/Intake Valve Control Circuit/Open. Take it to a friends shop for this issue along with few other things. We first think its the MDS solenoid as his diagnostic program advises this is the most common resolution. After inspection, mice had chewed the MDS wiring harness and bare wires look to be possibly touching each other. Replace the harness, and while there change all the plugs with OEM plugs. Still bucks hard at highway speeds. Take it back to him, replaces MDS solenoid, still bucks. He then was advised that he should disconnect the MDS harness and drive it around to clear the computer, he does this and it still bucks in the same manner. Finally cave in and take to a dealer for diagnosis, after 3 guys drive it trying to get it to act up it finally does and they are able to pull up a bulletin claiming a bad coil pack may be causing voltage spike/drop within the ECU and that is probably the issue. We replace all 8 coil packs. Thinking this is the solution for sure, i drive it home and try to replicate conditions to see if it will buck again, it doesn't and no CEL so we think we finally got it. Well she just experienced the bucking again and it didn't throw a CEL. I always use the proper 5w-20 mobile 1 oil, although it does consume oil at a decent rate (no leaks, or burning smell, and no smoking either so I don't know where the oil goes) so I have to keep it topped off between changes. But this is a 3 week ordeal and several hundred dollars have been dumped into this issue already. Anyone with any insight would be a huge help. Thanks!

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Old 08-18-2016, 07:57 PM
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Re: Serious problem. Need help!

It sounds like the "bucking" might be due to a wheel speed sensor. The engine problems were definitely there but the tire "chirp" may be due to the traction control locking wheels. You can turn the traction control off when it happens and see if the bucking stops, easy diagnosis. This happened to me on my 2006 Limited Hemi.
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Old 08-19-2016, 07:24 AM
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Re: Serious problem. Need help!

Quote:
Originally Posted by pbruecken View Post
It sounds like the "bucking" might be due to a wheel speed sensor. The engine problems were definitely there but the tire "chirp" may be due to the traction control locking wheels. You can turn the traction control off when it happens and see if the bucking stops, easy diagnosis. This happened to me on my 2006 Limited Hemi.
Was the "bucking" you experienced a quick single instance and then it was fine or was it repetitive? What speeds was yours happening at? I have only had it happen to me personally once and that was about 80mph, merging onto the highway i noticed it was taching around 3000-3200 which was a little high for the speed i was doing so i backed off the throttle and that's when it lurched forward and i heard what i think was the tire(s) chirp.
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Old 08-19-2016, 03:00 PM
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Re: Serious problem. Need help!

Sorry to hear you're having these problems. Definitely sounds like there may be two different issues, especially since you're "chirping" the tires when this occurs. With the different shops checking things out, has anyone put a good computerized diagnostic scanner (like the StarScan or Autel DS708) on it and taken it for a ride until it malfunctioned. They should be able to record live data, without codes showing, and/or freeze frame data, when a code is set. Reading/evaluating this data would pretty much isolate where the problem(s) are indicated.

Some info., FWIW, regarding the things they've already replaced. I've been on Chrysler Hemi related forums for about 12 years now and have never heard of an actual failure of an MDS Solenoid. Plenty of folks have been told this was the problem, but replacing it/them never fixed the problem. Both wiring and valve lifter problems would be a more likely area to look. The MDS will shut itself off under most circumstances if there is an engine management issue. Coil packs are another part that rarely fails, but if it does, it usually works or doesn't work. This can usually be isolated by a simple coil swap between the affected cylinder and another known good cylinder. Changing all 8 coils, IMO, is a waste of $$$.

Now to your problem, if you don't have access to a good computerized diagnostic scanner. A few simple things I'd check would be transmission fluid level and condition. How does the transmission up/down shift? Does it lag before going into gear, especially when cold? Does it shift hard or too soft? I'd check the EGR Valve. Stalling and rough/poor idle and surging are common symptoms of an EGR Valve that is going or has gone bad. I'd just pull the plug on it and see if it still malfunctions. You'll get a code because it's unplugged, but it will remove it from the loop unless it is stuck partially open. Just reset the code when done. The fuel purge solenoid, while not likely causing most of your issues, can cause rough idle and surging, again if it is bad or going bad.

Since yours is an 07, one thing I'd check for sure is the type of spark plug your mechanic has installed. Apparently there are two different Champion spark plugs with the same part number, and they're both different....dealer plugs have a black top and aftermarket has a silver top. Who does something that stupid? (Anyway that's why I run NGK's in both of my Hemi's) You can read all about this problem, pertaining to 07 Hemi's, on another Jeep forum where the thread is currently 77 pages and 1154 posts long. The final outcome appears to be the difference between the two spark plugs, the dealer ones (black top) being the ones that work and the other ones that cause the problem. Jee_Foru_.com, titled, "07 Jeep Grand Cherokee Overland Stalling Problem".

Good luck and let us know how this turns out.
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Old 08-27-2016, 03:43 PM
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Re: Serious problem. Need help!

Hey Dc, did you ever get the problem(s) fixed?
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